CVE-2019-25627
FlexHEX 2.71 Local Buffer Overflow via SEH Unicode
HIGH 8.6EPSS 0.3%
FlexHEX 2.71 contains a local buffer overflow vulnerability in the Stream Name field that allows local attackers to execute arbitrary code by triggering a structured exception handler (SEH) overflow. Attackers can craft a malicious text file with carefully aligned shellcode and SEH chain pointers, paste the contents into the Stream Name dialog, and execute arbitrary commands like calc.exe when the exception handler is triggered.
- Affected
- Flexhex · FlexHEX
- CVSS v4.0 VULNCHECK
- 8.6 HIGH
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v3.1 NVD
- 7.8 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS v3.1 VULNCHECK
- 8.4 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 0.26% chance of exploitation in the next 30 days, 16th percentile
- Published
- 2026-03-24
- Updated
- 2026-10-01
Proof-of-concept exploits (1)
Security advisories
- https://www.vulncheck.com/advisories/flexhex-local-buffer-overflow-via-seh-unicode
- http://www.flexhex.com
- http://www.flexhex.com/download/flexhex_setup.exe